XCode 12.4 : An Internal Error Occurred Editing functionality may be limited

user_2815436 0
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Since upgrading to XCode12.4 on two different MacBooks both running macOS 10.15.6 I have issues opening Storyboard / Xib files.

Just to be clear this doesn't occur for a specific project - this happens for any project I open and for any storyboard / xib file within that project.

There is a long delay before the file opens and when it does I see.

  1. The UI Components in blue outline rather than the details.

  2. The Error Message: An Internal Error Occurred Editing functionality may be limited

From my log.txt

XCODE VERSION INFO:

Version = 12.4 (12D4e)
Plugin Version = 17701
Beta Version = 1
OS Version = 10.15.6 (19G2021)


ASSERTION:

Failed to update scene '01J-lp-oVM' with IBUIViewAutolayoutGuide (x1), UIView (x1), and UIViewController (x1).

Exception name: IBPlatformToolFailureException
Exception reason: The tool closed the connection

Application Specific Information:
** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Failed to create remote render context'

terminating with uncaught exception of type NSException
abort() called
CoreSimulator 732.18.6 - Device: iPhone Xʀ (9B855293-1F8D-4794-BF54-5193C46BB094) - Runtime: iOS 14.4 (18D46) - DeviceType: iPhone Xʀ

I've cleaned derived data / restarted my machine etc - all to no avail.

All I can do at this stage is reinstall XCode 12.4 unless anyone can make any suggestions?

xcode interface-builder
3 Answers

If you have a new mac with apple silicon, try to uncheck Open using Rosetta.

enter image description here

user_3965370

Close the xcode and simulator and run this command on the terminal

This will help to remove storyboard loading errors

rm -rf ~/Library/Developer/Xcode/DerivedData/

user_154080110

For me, I just build and run a project, and then this error disappears.

user_70271040
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